this part that connects to the gutter downspout is a cap of some sort that goes over a receiving part that goes to sewer drains. I'm not sure what it is called. My home was built in the late 1920s. I'm wondering if there is a more modern replacement for this part or a better way to redo and seal this because I think it sometimes backs up during heavy rain and leaks into the basement. You can see it doesn't make a complete seal. Thank you.